Oil-burner system



M. A. FESLEB.

OIL BURNER SYSTEM. APPLICATION FILED APR. 11, I918.

1 ,396 823, Patented Nov. 15, 1921.

4 SHEETS-SHEET1- Fig.1

M. A. FESLER. OIL BURNER SYSTEM.

APPLICATION FILED APR-11.1918.

Patented Nov. 15, 1921.

4 SHEETSSHEET 2.

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' MILTON A. FESLEB, OI OAKLAND, CALIFORNIA, ASSIGNOR, BY MESNE ASSI cmmmrrs,

'10 rn'monnum HEAT AND POWER COMPANY, A coRroRA'rIoN or DELAWARE.

OIL-BURNER SYSTEM.

panying drawings, is a specification, like characters on the drawings representing like parts.

The invention hereinafter described relates to oil burner systems.

Burners of'this type are provided with means to supply oil thereto, and means to force air thereto which atomizes the oil and combines therewith to produce a combustible mixture of the desired character. Qne of the objects of the invention is to prov de simple and effective means for forcing the air to the burner in the form of a fan driven by an electric motor, the construction being such that the air supplied to the fan serves to cool and prevent overheating of the motor.

It is desirable from time to time to vary the quantity of air mixed with the oil to vary the character of the combustible mixture. Another object of the invention is to provide simple and effective means whereby the supply of air to'the burner may be readily regulated as required.

Another object of the invention is to provide simple and efiective suction means for drawing the fuel from its source of supply for delivery to the burner.

Another object of the invention is to provide driving means for the suction means which may be responsive to the speed of' the air supply fan and automatically increase the amount of oil fed from the oil supply as the air supply increases.

Another object of the invention is to provide simple and effective temperature responsive means for regulating the amount of fuel fed to the burner, said means being controlled by the temperature of the water or other medium heated by the burner.

And still an'other object of the invention is to provide a simple, compact and eflicient burner system sultable for domestic and other uses.

With the aforesaid and other objects in view, the character of the invention will be best understood by reference to. the following description of one good form thereof Specification of Letters Patent.

Application filed April 11,

Patented Nov. 15, 1921.

1918. Serial No. 227,910.

shown in the accompanying drawings, where1 n2 Figure 1 1s a side elevation of an oil burner embodying the invention applied to a furnace;

Fig. 2 on an enlarged scale is a rear elevat on of theburner, and air and oil supply devlces associated therewith;

Fig. 3 on an enlarged scale is a vertical section taken on line 3--3 of Fig. 2, showing the suction gear pump and pipes leading thereto;

3 on an enlarged scale is a vertical sect on taken on line 3*3 of Fig. 2;

Fig. 4 on an enlarged scale is a vertical section taken on line 4-4 of Fig. 2 showing telescoping tubesfor conducting oil from the'thermostat to the burner;

F g. 5 on an enlarged scale is a horizontal section through the motor, the air supply fan, the suction gear pump, and the fan for driv ng the latter;

. Fig. 6 is a vertical section taken on line 6-6 of Fig. 5;

Fig. 7 on an enlarged scale is a section :taken on line 7--7 of Fig. 6;

Fig. 8 is a vertical section through .the

' thermostat and the bowl or chamber for supplying oil thereto; Flg. 9 on an enlarged scale is a vertical section taken on line 9-9 of Fig.6;

Fig. 10 on an enlarged scale is a longitudinal section throughthe Venturi tube and the adjustable sleevethereon;

Fig. 11 is a transverse section taken on.

line 11-11 of Fig. 10; and

Fig. 12 is a vertical section through the I vacuum tank shown in Fig. 1.

Referring to the drawings, 1 (Fig. 1) designates awater tube furnace of usual construction and therefore unnecessary to show and describe in detail herein. The oil burner system selected to illustrate the invention, is applied to this furnace and comprises a burner (Fig. 6) having an outer cylinder or casing 3 adapted to slide to and from active firing position in the furnace through an aperture 5 in a plate or support 9 secured by-bolts 11 to the front of the furnace.

A Within the burner cylinder 3 is mounted a Venturi tube 13 .(Fig. 6) having a flaring delivery and fitted into and secured to said cylinder. Air may be forced into this Venturi tube through the inner end, thereof and cylinder. To contribute to the atomizing of the oil, the Venturi tube may have a multiplicity of ports 17 therein adjacent the delivery end thereof, preferably extending obliquely to the axis of-said tube and obliquely circumferentially' of said tube, the construction being such that the air passing from the chamber through the ports is directed inwardly and circumferentially of the tube to produce a desirable swirling and atomizing'efiect which thoroughly breaks up and atomizes the oil to produce an eflicient com- 1 bustible mixture.

-to the Venturi tube ports 17. The sleeve 19 may be given a rotary adjustment about the Venturi. tube to cause the ports 17 to register more or less fully with the ports 21, and thereby vary theefi'ective opening of the ports 17.. .To adjust the sleeve 19 for this purpose, suitable means may be provided,

. in the present instance, in the form of a shaft 23 fitted in a boss bearing 25 projecting rearwardly from the burner casing, the forward end of said shaft being connected by arms 24 to the sleeve 19, and the rear end of said shaft being provided with a handle 27 which may be rocked to impart the rotative adjustment of the sleeve to the extent desired. To .hold the handle in its different positions of adjustment, a leaf spring 28 may be mounted'thereon carrying a dog 29 adapt- .ed' to engage with. a series of radial indentations 31 on a plate 33 projecting upward from the boss 25 (Figs. 2 and 5). The spaces betweenthe arms 24 are sufficiently large to allow the air to readily pass into the Venturi tube .as required.

The meansrfor" forcing the air to the burner, in the present instance, comprises a cylindrical casing 37 (Fig. 6) having an opening 39 communicating with the space surrounding the Venturi tube, and a fan 41 (Figs. 5 and 6) mounted in said casing. To rotate the fan, an electric motor 43 may be provided comprising the usual field and armature, the latter having a shaft 49 (Fig. 5) projecting into the fan casing 37 with the fan mounted fast thereon.

The means for cooling the electric motor, in the resent instance, comprises a casing 51 encirc mg the field of the motor, and provided with an extended surface conveniently in the form of a series of ribs 53 projecting radially from the casing 51 and inclosed by an outer casing 55 secured to thefan casing 37. Air may be conducted into this outer casing adjacent one end thereof through a series of apertures 57 in said casing. A plate 59 is fitted to the opposite end of said casing between the motor and the fan 41, and preferably may be conical in form to direct the air toward the axis of the fan, the air being adapted to pass through an annular port 61 adjacent the shaft for the motor and the fan.

The construction is such'that when the fan is driven by the motor, air will be drawn through the apertures 57 and thence in a direction parallel to the motor shaft through the spaces between the ribs 53, thereby producing a desirable cooling effect on the motor. The air passes thence to the conical plate 59 toward the fan shaft, and is forced by the fan outwardly toward the periphery of the fan casing and thence through the opening 39 to the air chamber surrounding the Venturi tube.

Next will be described the means for supplying the oil to the burner. To accomplish this, in the present instance, a nozzle 63 (Fig. 6) is provided projecting into thethroat of the Venturi tube. A pipe 65 has one end connected to the nozzle 63 and its opposite end connected to an elbow pipe 67 (Fig. 4) projecting laterally from a tube 69 telescoping with a tube 71 having at one end thereof a lateral port 73 for communication with the elbow pipe 67, the opposite end of said tube 71 being threaded to a boss 75 projecting from the face of the plate 9 supporting the burner. To prevent leakage of oil between the telescoping tubes, a stufiing box may be provided therefor comprising a gland 77 threaded to a boss 79 projecting laterally from an arm 80 projecting fromthe burner casing and threaded to the tube 69. Said gland is adapted to confine suitable packing material 81 between said gland and the end of the tube 69. i

The construction is such that when the burner is adjusted to its. firing position in the furnace, the port 73 will be in registration' with the elbow pipe 67 and admit oil to the burner, but when the burner iswithdrawn from its firing position, the port 73 will be cut off from communication with said elbow pipe and prevent feeding of oil to the burner. After the tube 69 has moved outward sufiiciently to shutoff the port 73, the end of the tube 71 will act as a plunger in the tube 69 and produce a suction in the elbow 67, ipe 65 and nozzle 63, which will serve to rawresidual oil therefrom and prevent carbonization thereof thereon and clogging of the passages.

To conduct oil to the tube 71, a port 83 may be formed in the plate 9 for communication with a pipe 85 having one end secured to said plate and its opposite end communicating with a port 87 (Fig. 8) in the top of a casing 89 having an oil receiving chamber 91 therein. Oil may be supplied to this chamber through a port 93 communicating with a bowl or casing 95 containing a float livered to the burner.

97 controlling the needle valve 99 cooperating with a port 101 in a fitting 103 connected to an oil supply pipe 105. The construction is such that the float will automatically rise and fall to control the needle valve and maintain a predetermined level of oil in the chamber 91. a The suction of the air forced through the Venturi tube above the nozzle 63 is sufiicient to draw the oil from the chamber 91 through the pipe and nozzle 63 to the Venturi tube.

Next will be described the means for automatically controlling the amount of oil de- In the present, instance, this means comprises a needle valve 107 (Fig. 8')"mo'vable axially in a bearing 109 projecting from a dished wall 111 of the oil chamber 91. This needle valve is adapted to throttle the port 87 more or less to vary the qluantity of oil fed therethrough. This need e valve may be automatically moved for this urpose by temperature responsive means, 1n the present instance, comprising a diaphragm 113 of spun brass or other suitable material encircling the needle valve and confined between the dished wall 111 and a flange 115 fast on the needle valve. The diaphragm may contain ether 117 or other medium having a high coefficient of expansion, such that when subjected to heat, it will cause the flexible diaphragm to expand and adjust the needle valve upwardly to throttle the port 87 more or less completely as required. To move the needle valve in the opposite direction, a coil spring 119 may be provided encircling said needle va ve and confined between the outer wall of a water chamber 121 and a collar 123 secured to the needle valve. The opening movement of the'needle valve may be limited by a stop in the form of a screw 125 tapped in a yoke 127 carried by a casing 129 inclosing said spring and the outer end of the needle valve and threaded to a boss on the water chamtubes thereof, and said chamber is connected to a pipe 135 communicating with water tubes of the furnace at a point lower than saidv header.

The construction is such that the water' will circulate from the furnace down thrdugh the pipe 133 through the water chamber 121 and through the pipe 135 back to the furnace. The heat from the water in this chamber will be transmitted to the thermostat and cause the ether therein to expand or contract,'according to the rise or fall of the temperature of the water. If the temperature of the water rises, the needle valve will throttle the supply of oil to the burner, thereby. reducing the heat of the flame issuingfrom the burner. On the other hand, if the temperature of the water in the chamber 121 falls, the ether will contract and allow the spring 119 to open the needle valve further and increase the supply of oil to the burner, thereby increasing the heat of the flame issuing there-from. Thus, simple and effective means is provided for automatically maintaining the water of the furnace at a predetermined temperature with a minimum amount of fuel, and with- -out requiring manual regulation thereof:

The oil may be supplied to the burner from a suitable reservoir 139 (Fig. 1) preferably located in a pit 141 outside of the building containing the furnace and beneath the level of the floor 143 supporting the furnace, said reservoir being preferably separated from the room containing the furnace by a wall 145 of concrete or other suitable fire-proof material. The reservoir may have a pipe 139 for filling the same and a vent 139 to allow air to pass to and from the reservoir.

Next will be describedmeans for feeding the oil from-the reservoir to the pipe 105 leading to the float casing and to the burner. To accomplish this, a suction tank 147 (Figs. 1 and 12) may be mounted on a bracket 149 conveniently carried by the wall 145, said tank being-secured on said bracket by a strap 151 embracing said tank and connected to said wall. The tank contains a suction chamber 153 and a discharge chamber 155, the latter being connected-t0 the oil supply pipe 105 which preferably projects a substantial. distance into said discharge chamber to trap therein any sediment contained in the oil. This sediment may be flushed from the discharge chamber by a pet cock-157. i

The oil may be fed from the reservoir through a pipe 158 (Fig. 1) projecting from a point adjacent the bottom of the reservoir through the top thereof and thence along and through the wall 145 to the top of the tank, where it communicates with the suction chamber 153. A suitable strainer 159 may be provided at the delivery end of the pipe 158 to prevent solid matter in the oil from entering the suction chamber.

The suction chamber may be providedwith a suction valve 161 for controlling the suction effect produced through a pipe 163 connected to the top of the tank and communicating with. a vacuum or suction producing device to be described.

An air valve 165 may also be provided at the top of the suction chamber to control the admission of air thereto. The discharge chamber 155 may be continuously open to the outside air through an annular passage 167 surrounding the suction chamber, and through a port 169 communicating with an air pipe 171 which also serves to admit air to the air Valve 165.

To automatically operate the suction and air valves, a float 17 3 may be mounted in the suction chamber and be guided by a stem 175 projecting into a port 177 for permitting the oil to flow from the suction chamber into the discharge chamber. The lower end of the port 177 may have a flap valve 179 which will be closed by the suction in the suction chamber, but will open when suction is released therefrom to allow the oil to flow from the suction chamber into the .discharge chamber.

The upper end of the float may have a stem 181 connected to one end of alever 183 fulcrumed on a pin 185 carried by a member 187 depending from the top of the tank into the suction chamber. Upward tilting of the lever 183 may be limited by engagement of the lug 189 with a stop formed on said memher. The lever 183 may be connected by a link 191 with a lever 193 fast on a shaft 195 mounted in a fork 197 depending from the top of the tank. An arm 199 fulcrumed on said shaft may be connected to the suction valve and air Valve. springs 201 may have ends connected to studs adjacent the free end of the arm 199 and opposite ends connected to studs at the free end of the arm 193.

The construction is such that when the float 173 rises, it will tilt the arm 193 in a clockwise direction, thereby moving the springs 201.up.past the shaft 195. When this occurs the springs will contract, rock the arm 199 ina contra-clockwise direction, and close the suction valve and open the air valve. When the float lowers, it will rock the arm 193 in a contra-clockwise direction and move the springs .down past the shaft 195. When this occurs, the springs Wlll contract and rock the arm 199 in a clockwise direction, thereby opening the suction valve and closing the air valve.

Next will be described the means for producing the suction in the chamber 153. To

accomplish this, in the present instance, the suction pipe 163 is extended to and connected to the plate 9 supporting the burner, said pipe communicating with a duct 203 (Fig. 3) formed in said-plate. This duct communicates with a tube 205 threaded into a bore in said plate and telescoping with a tube 207 The tube 205 has a lateral port 209 in the-end thereof communicating with an elbow pipe 211 which forms a continuation of the tube 207. To prevent leakage between the tubes 205 and 207, a suitable stufiing box may be provided comprising a land 213 threaded into a counterbore in a oss 215 on an arm 216 projecting from the burner casing and threaded to the tube 207.

One or more Said gland confines suitable packing material 217 between said gland and tube 207. These telescoping tubes are constructed to permit the burner to be moved to and from its active firing position in the furnace.

In the present instance, the vacuum or suction effect is established in the vacuum chamber of the suction tank and in the pipes and tubes just described, by a rotary gear pump comprising a casing 219 connected to the elbow pipe 211 by a pipe 221. The casing 219 contains and is formed to fit properly around a pair of intermeshing gears 223 and 225 on shafts 227 and 229 journaled in bearings in the casing. .The casing 219, in the present instance, is secured by curved arms 230 (Fig. 5) to the fan casing 37, referred to.

The pump casing may be provided with a passage 233 (Fig. 3) having its upper end tapped to receive a small cylinder 235 provided with a port 237 communicating-with the passage 223 and with lateral ports 239. A ball valve 241 is urged to a position to close the port 237 by a helical spring 243 confined between said ball valve and a plug 245 threaded into the upper end of said cylinder.

A-small quantity of lubricating oil is introduced into the pump casing in order to maintain an oil film between the teeth of the pump gears and the curved walls of the pump casing and prevent leakage between said teeth and walls and insure efficient suction effect. A by-pass port 247 is provided in the casing beneath the lower gear, and extends from the lower end of the suction port 249 to the lower end of the discharge port 23. The construction is such that the excess lubricatin oil may circulate through the by-pass in tie direction of the arrows (Fig. 3), the flow through said by-pass being controlled by a screw needle valve 251 for throttling a constricted port- 253 in the by-pass more or less as required. Theoil will be transmitted from the teeth of the lower gear to the teeth of the upper gear, engaging therewith to maintain the proper film of oil between the upper gear and the wall of the casing thereat. Preferably the suction port 249 extends upward from the level of the point of engagement of the ears, and is provided with a spring-pressed all valve 254. This ball valve will automatically open to allow the pump to produce the suction effect, but when the valve 161 at the suction tank is closed, the spring will close the valve and revent the lubricating oil passing from t e by-pass to the gears of the pump, from being drawn into the pipe 221 eading to the suction tank.

Next will be described means for rotating the gears of the suction pump. To accomplish this, in the present instance, the shaft 227 for the upper pump gear extends from the pump casing inward toward and in axial alinement with the fan and motor Zhaft 49 (Fig. A fan 255 (Figs. '3 and 255 projecting laterall from a disk 255 and through said passage. flow of air through said passage will 1nfrom a hub 257 spline on the shaft 227 A helical sprin 261 may be provided encircling the sha t 227 and confined between one end of said fan hub and a flange 263 on the end of the shaft 227. This sprin may slide the fanhub outward until limited by a shoulder 265 formed on said shaft.

curved bla es of the pump fan and rotates the fan and the pump. A desirable cooperation'is obtained between the motor driven fan supplying air to the burner and the pump drivmg fan, whereby the suction of'fuel produced by the pump is automatically proportioned to the quantit of air delivered'to the burner. For examp e, if the amount of air delivered to the burner is increased, the suction effect throu h the casing opening 271 will be increase and the pressure on the fan disk will be increased, thereby moving the fan axially inward against the resistance of the spring 261. The annular opening 273 surrounding the pump fan will be enlarged in proportion to the inward axial movement of the fan, and allow a reatcr flow of air his increase in the crease the s eed of the pump fan, increase the speed 0 rotation of the pump, and increase the suction efl'ect produced thereby. This will increase the amount of fuel delivered from the reservoir. A'balll bearing 274 may be provided to reduce friction between the pump gear 223 and the wall of the pump caSing'ad acent thereto. It will be understood that air is supplied to the motor driven fan 41 around the motor to cool the same .and also through the opening 271at the pump fan. However, the greateramount of the air required b the motor driven fan is supplied around t e motor.

rom the foregoing description, the opera tion of the apparatus will be readily understood. The burner, motor driven fan, mo-

tor, gear pump and its fan, are moved as a unitto bring the burner to its active firing osition within the furnace, this movement ing permitted by the telescopic tubes in the oil feed system, and the telescopic tubes in the air suction system. Then the motor may be provided having curved blades delivery end of the is started, thereby driving the fan 41 which draws air through-the openings 57 through the passages between the ribs connecting the inner and outer casings of the motor to cool the same, the air being deflected by the plate 59 thence inwardly toward the axis of the fan 41. It is forced by the latter into the inner end of the Venturi tube and into the chamber surrounding the same, and

thence into the mixin chamber adjacent the enturi tube, where it thoroughl atomizes the oil for efficient combustion. he handle 27 is adjusted to turn the sleeve 19 on the Venturi tube to cause the ports in said sleeve to register more or less completely with the ports in the Venturi tube to control the How of air into the Venturi tube adjacent'the delivery end thereof as required. The flow of air through the inner end of the Venturi tube passes the upper end of the nozzle 63, draws the oil into the Venturi tube from the chamber 91 at the. thermostat receiving its supply of oil from the float chamber 95.

The hot water circulating through the water chamber 121 at the-thermostat, raises the temperature of the oil in the chamber 91 and renders the same morefiowable and in better condition for thorough atomizing in the Venturi tube. The water circulating through the water chamber 121 from the,

furnace tubes, will cause the temperature responsive medium in the diaphragm 118 to expand or contract in accordance with the rise ,and fall of the temperature of the circulating water, and thereby automatically adjust the needle valve 107 to control the delivery of oil through the port 87 to the Venturi tube as required. As a result, the water circulating throu h the furnace may be maintained at a pre etermined temperature automatically without requiring manual regulation.

The suction tank 147 delivers the oil from i the oil reservoir to the float chamber 95 to always maintain the requisite quantity of oil in said chamber. The suction produced by the motor driven fan through the open.- ing leading to the pump fan automaticallyrotates said fan and rotates the pump with the speed required to produce the required amount, of vacuum effect or suction in the vacuum chamber of the tank 147 to insure the proper feed of the oil from the reservoir.

ere are important advantages in driving thepump pneumatically by a small fan which is driven by the larger fan which supplies air'to the burner. There is a-desirable responsiveness in the speed of the.small fan to the speed of the larger fan, but the pum fan may be driven at a much slower spec which is adequate to deliver the small amount of fuel which the burner requires. This relatively slow speed is made possible by the film of lubricating oil which is main;

'tained betweenthe pump gears and their casing and materially contributes to the suction efliciency of the pump. Since thepump is driven at slow speed, excess suction is avoided, wear and tear on the pump is greatly reduced, and power is saved.

It will be noted that the pump serves to draw the fuel from the reservoir to the suction chamber 153, but the fuel is prevented by the valve 161 from reaching the pump.

It will be understood that the invention is i not limited to'the specific embodiment shown, but that various deviations may be made "turi tube therein, a nozzleto deliver oil to {said Venturi tube, means for conducting air fan for forcing air to the burner, an electric motor for driving the fan having a motor Casin a field inclosing casing. within the motor casing and supported by the motor casingin' spaced relation thereto, and a plurality of longitudinally extending cooling a flanges between. said casings, said motor casing constructed'to conduct air to thefan pastsaid flanges to cool the motor.

2. A burner comprising a casing, a Veninto said casing about the Venturi tube, the

" latter having ports to conduct the air in the casing totheinterior of the tube, a sleeve within said casing cooperating with said ports, and manna 1y adjustable means for adjusting the sleeve relative to the ports to vary the'eflective openings of the ports.

3A. burner comprising a casing, a Venturi tube therein a nozzle to deliver oil to said Venturi tube, means for conducting 40 air into said casing, said Venturi tube having ports to conduct the air from the casing to the interior of the tube, and means within the casing to vary the eflective openings of said ports.

4.-. The combination with a burner, of means to supply air thereto; means to supply fuelto said burner including a pump, and means actuated by the flow of air produced by said air supply means for driving said pump.

5. The combination with a burner, of a fan to supply air thereto, means to supply fuel to said burner including a pump, and a fan adapted to be actuated by air flowing to said air supply fan for driving said pump.

6. The combination with a burner, of. a fan to supply air thereto, means to supply fuel to said burner including a pump, a fan adapted to be actuated by air flowing to said air supply fan for driving said pump, and means responsive to the speed of said air supply fan for varying the speed of said pump actuatin fan.

7. The combination with a burner, of a reservoir to supply fuel thereto, means inmosses eluding a gear pump for feeding the fuel from said reservoir to said burner, a fan for supplying airto .said burner, and a fan adapted to be actuated by said air supplying fan for rotating said gear pump.

8. The'combination with a burner, of a reservoir-to supply fuel thereto, means including a pump for feeding the fuel from said reservoir to said burner, a fan for supplying air to said burner,-and means actuated by said fan for driving said pump.

9. The, combination with a burner, of means to supply fuel thereto including a pump, a fan to supply air to said burner, and means adapted to be actuated by the suction of air to said fan for driving said pump.

1 0. The combination with a burner, of means to supply fuel thereto including a float chamber, a thermostat chamber for receiving fuel from said float chamber, a valve for admitting fuel to said float chamher, a float for controlling said valve, a valve for permitting discharge of fuel from said thermostat chamber, a thermostat for controlling said discharge valve, and means to subject said thermostat to the heat of the medium heated by theburner.

11. The combination with a burner, of a support therefor, means including telescoping tubes respectively connected to said su port and burner for conducting fuel to said burner, fuel supply means, a suction chamber communicating with the latter, a suction pump, and means to transmit the suction effect of said pump to said chamber including telescoping tubes respectively connected to said support and burner, said burner being adjustable relatively to said support to and from active firing position.

12. In combination, a burner having a fan for forcing air thereto, a fan driving motor and a pump, all movable as a unit toward and from the position Lin which the heat of the burner is to be utilized, a fuel supply container, means including a vacuum tank to deliver fuel from said container to .the movable burntf unit, and connections between the vacuum tank and pump that the latter'may produce a partial vacuum in the tank, said fan operable to force air into the burner to draw the fuel into the burner and atomize the fuel.

13. In combination, a burner having a fan for forcing air thereto, a fan driving motor and a pump, all movable as a unit toward and from the posit-ion in which the heat of the burner is to be utilized, a fuel. supply container, means including a fixed vacuum tank to deliver fuel from said container to themovable burner unit, and connections between the vacuum tank and movable pump that the .latter may produce an operating vacuum in the tank, said burner constructed and arranged to cause the force of air to draw the fuel into the burner and atomize the fuel.

14. In combination with a burner having a Venturi tube, of fuel supply means, a fuel conduit between" said means and the Venturi tube, suction feed means for delivering fuel through the conduit, and a fan for delivering its blast of air through the Venturi tube to lift the fuel from said conduit into the Venturi tube.

15. In combination with a burner, of a fuel supply container, a fuel conduit between the container and burner, vacuum feed means for delivering fuel through the conduit, means to force fluid through said burner to draw the fuel intothe burner and atomize the fuel, and means for regulating the supply of fluid to the burner.

16. In combination, a burner having means for delivering a blast of air thereto, a fuel supply container, suction feed means for conducting fuel from the container to the burner, a rotary gear, air pump for reducing the air pressure to produce the suction feed, and operating means for said pump adapted to be actuated by said blast of air.

1. In combination,a burner having means for delivering a blast of air thereto, a fuel supply container, suction feed means for conducting fuel'from the container to the burner, a rotary gear, air pump for reducing the air pressure to produce the suction feed, and a fan adapted to be actuated by said blast of air to drive the pump.

18. In combination with a burner, of fuel supply means, suction feed means for conducting fuel from the supply means to the 19. The combination with a burner, of

fuel supply means, means for supplying a blast of air to the burner, and means to deliver fuel from said supply means to said burner including a pump having a casing,"

intermeshing pump gears in said casing, and means to maintain a film of lubricant between said gears and casing to contribute to the efficiency of said pump; and pneumatic means operated by said air blast to rotate said pump gears.

20. The combination with a burner, of means to deliver fuel thereto including a vacuum chamber, an air pump for producing a vacuum effect in said chamber, means to prevent the fuel from reaching said pump; and means including a fan to supply fluid to said burner to atomize the fuel.

21. In combination, a burner having a fan for forcing air thereto, a fan driving motor, and a fuel pum all mounted to be slid as a unit to and rom the firing position, a fuel supply container, and conduit means connecting the container and burner, including telescopic pipe connections to permit sliding movement of the burner unit relative to the container. I

In testimony whereof, I have signed'my name to this specification.

- MILTON A. FESLER. 

